US3724652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin disc pack
Assignee: Singer Co
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Filing: 1971-06-14
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Granted: 1973-04-03
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Expires: 1991-06-14
Abstract
Abstract A twin disk pack assembly comprising a first or lower disc pack and a second or upper disk pack. Each disk pack has a number of stacked discs coaxially mounted on a hub in spaced apart relation. Each of the discs has a magnetic recording surface for storing information. The lower disk pack is first placed on the spindle and then the upper disk pack is placed on the spindle and secured thereto. The lower disc pack is provided with a fixed drive pin that is adapted to be inserted into a hole located in the hub of the upper disk pack. Visible indexing symbols are placed on the surface of the uppermost disc of each disk pack to facilitate the engagement of the drive pin in its mating hole. In addition, stabilizer pins are provided to preventing tipping of the upper disc pack before the drive pin has been engaged.
Inventors
- 👤 J Francini
- 👤 M Verdone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:58
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B17/00; G11B17/02; G11B17/021; G11B17/038; G11B23/02; G11B23/03; G11B23/032; G11B23/0323; G11B5/00; G11B5/74; G11B5/82; G11B5/825
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
78 words
A twin disc pack assembly comprising: a rotatable spindle; a first disc pack; means to removably mount said first disc pack onto said spindle; a second disc pack; means to removably mount said second disc pack onto said spindle above said first disc pack; releasable means coupling said second disc pack to said first disc pack to insure synchronous rotation of said first and second disc pack and; means to secure said second disc pack to said spindle.
Claim 2
Dependent Claim
78 words
A twin disc pack assembly comprising: a rotatable spindle; a first disc pack; means to removably mount said first disc pack onto said spindle; a second disc pack; means to removably mount said second disc pack onto said spindle above said first disc pack; releasable means coupling said second disc pack to said first disc pack to insure synchronous rotation of said first and second disc pack and; means to secure said second disc pack to said spindle.
Claim 3
Dependent Claim
58 words
A twin disc pack assembly as defined in claim 1 wherein said means to mount said first disc pack onto said spindle is a hub that forms a part of said first disc pack and said means to mount said second disc pack on said spindle is a hub that forms a part of said second disc pack.
Claim 4
Dependent Claim
37 words
A twin disc pack assembly as defined in claim 2 wherein said second disc pack hub surrounds a portion of said first disc pack hub when said first and second disc packs are mounted on said spindle.
Claim 5
Dependent Claim
38 words
A twin disc pack assembly as defined in claim 2 wherein said hub of said second disc pack abuts said hub of said first disc pack when said first and second disc packs are mounted on said spindle.
Claim 6
Dependent Claim
58 words
A twin disc pack assembly as defined in claim 2 wherein said first disc pack comprises a plurality of magnetic coated discs coaxially mounted on said first disc pack hub in a spaced apart relation and said second disc pack comprises a plurality of discs coaxially mounted on said second disc pack hub in a spaced apart relation.
Claim 7
Dependent Claim
32 words
A twin disc pack assembly as defined in claim 5 wherein the lowermost disc of said plurality of discs of said first disc pack is provided with a plurality of positioning notches.
Claim 8
Dependent Claim
47 words
A twin disc pack assembly as defined in claim 2 wherein said hub of said first disc pack includes a fixed drive pin and wherein said hub of said second disc pack includes a hole for mating with said drive pin of said first disc pack hub.
Claim 9
Dependent Claim
35 words
A twin disc pack assembly as defined in claim 7 wherein the uppermost discs of both said first and said second disc packs each include a symbol for aligning said drive pin with said hole.
Claim 10
Dependent Claim
16 words
A twin disc pack assembly as defined in claim 2 wherein said spindle is conical shaped.
Claim 11
Dependent Claim
59 words
A twin disc pack assembly as defined in claim 9 wherein in said first disc pack hub has a conical inner surface tapered to match said taper on the lower part of said conical spindle and said second disc pack hub has an inner conical surface tapered to match the taper of the upper part of said conical spindle.
Claim 12
Dependent Claim
41 words
A twin disc pack assembly as defined in claim 10 wherein said first disc pack hub has a fixed drive pin fabricated therein and said second disc pack hub has a hole fabricated therein for mating with said fixed drive pin.
Claim 13
Dependent Claim
54 words
A twin disc pack assembly as defined in claim 10 wherein said first disc pack hub has a plurality of stabilizing pins mounted thereon equidistant from the center of said first disc pack hub but at different radial angles and said second disc pack hub has a surface for mating with said stabilizing pins.
Claim 14
Dependent Claim
45 words
A twin disc pack assembly as defined in claim 9 wherein said first disc pack hub has an inner conical surface tapered to match the taper of said conical shaped spindle and has a conical shaped outer surface at the topmost part of said hub.
Claim 15
Dependent Claim
37 words
A twin disc pack assembly as set forth in claim 13 wherein said second disc pack hub has a conical inner surface tapered to fit over said outer conical shaped surface of said first disc pack hub.
Claim 16
Dependent Claim
54 words
A twin disc pack assembly as defined in claim 14 wherein said first disc pack hub has a plurality of stabilizing pins mounted thereon equidistant from the center of said first disc pack hub but at different radial angles and said second disc pack hub has a groove for mating with said stabilizing pins.
Claim 17
Dependent Claim
41 words
A twin disc pack assembly as defined in claim 14 wherein said first disc pack hub has a fixed drive pin fabricated therein and said second disc pack hub has a hole fabricated therein for mating with said fixed drive pin.
Claim 18
Dependent Claim
33 words
A twin disc pack assembly as defined in claim 1 wherein means are provided to prevent tipping of said second disc pack when said second disc pack is first mounted on said spindle.
Claim 19
Dependent Claim
48 words
A twin disc pack assembly as defined in claim 17 wherein said means to prevent tipping comprises a plurality of spring biased pins associated with said lower disc pack hub and a surface associated with said first disc pack hub, said surface mating with said spring biased pins.
Claim 20
Dependent Claim
100 words
A twin disc pack assembly adapted to be attached to the motor-driven rotatable spindle of a disc drive and which comprises: a first disc pack; means to removably mount said first disc pack onto the spindle of a disc drive; a second disc pack; means to removably mount said second disc pack onto said spindle above said first disc pack; means to releasably secure said second disc pack to said first disc pack to preclude relative movement therebetween and to provide synchronous rotation of said first and second disc pack; means to secure said second disc pack to said spindle.
Claim 21
Dependent Claim
100 words
A twin disc pack assembly adapted to be attached to the motor-driven rotatable spindle of a disc drive and which comprises: a first disc pack; means to removably mount said first disc pack onto the spindle of a disc drive; a second disc pack; means to removably mount said second disc pack onto said spindle above said first disc pack; means to releasably secure said second disc pack to said first disc pack to preclude relative movement therebetween and to provide synchronous rotation of said first and second disc pack; means to secure said second disc pack to said spindle.
Claim 22
Dependent Claim
58 words
A twin disc pack assembly as defined in claim 19 wherein said means to mount said first disc pack onto said spindle is a hub that forms a part of said first disc pack and said means to mount said second disc pack on said spindle is a hub that forms a part of said second disc pack.
Claim 23
Dependent Claim
38 words
A twin disc pack assembly as defined in claim 20 wherein said hub of said second disc pack abuts said hub of said first disc pack when said first and second disc packs are mounted on said spindle.
Claim 24
Dependent Claim
36 words
A twin disc pack assembly as defined in claim 19 wherein means carried by the first disc pack prevent tipping of said second disc pack whEn said second disc pack is first mounted on said spindle.
Claim 25
Dependent Claim
48 words
A twin disc pack assembly as defined in claim 22 wherein said means to prevent tipping comprises a plurality of spring biased pins associated with said lower disc pack hub and a surface associated with said first disc pack hub, said surface mating with said spring biased pins.
Claim 26
Dependent Claim
58 words
A twin disc pack assembly as defined in claim 20 wherein said first disc pack comprises a plurality of magnetic coated discs coaxially mounted on said first disc pack hub in a spaced apart relation and said second disc pack comprises a plurality of discs coaxially mounted on said second disc pack hub in a spaced apart relation.
Claim 27
Dependent Claim
32 words
A twin disc pack assembly as defined in claim 24 wherein the lowermost disc of said plurality of discs of said first disc pack is provided with a plurality of positioning notches.
Claim 28
Dependent Claim
60 words
A twin disc pack assembly as defined in claim 20 wherein said hub of said first disc pack includes a fixed drive pin and wherein said hub of said second disc pack includes a hole for mating with said drive pin of said first disc pack hub and for releasably securing the second disc pack to the first disc pack.
Claim 29
Dependent Claim
34 words
A twin disc pack assembly as defined in claim 26 wherein the uppermost discs of both said first and second disc packs each include a symbol for aligning said drive pin with said hole.
Claim 30
Dependent Claim
16 words
A twin disc pack assembly as defined in claim 20 wherein said spindle is conical shaped.
Claim 31
Dependent Claim
58 words
A twin disc pack assembly as defined in claim 23 wherein said first disc pack hub has a conical inner surface tapered to match said taper on the lower part of said conical spindle and said second disc pack hub has an inner conical surface tapered to match the taper of the upper part of said conical spindle.
Claim 32
Dependent Claim
41 words
A twin disc pack assembly as defined in claim 29 wherein said first disc pack hub has a fixed drive pin fabricated therein and said taper disc pack hub has a hole fabricated therein for mating with said fixed drive pin.
Claim 33
Dependent Claim
45 words
A twin disc pack assembly as defined in claim 28 wherein said first disc pack hub has an inner conical surface tapered to match the taper of said conical shaped spindle and has a conical shaped outer surface at the topmost part of said hub.
Claim 34
Dependent Claim
37 words
A twin disc pack assembly as set forth in claim 31 wherein said second disc pack hub has a conical inner surface tapered to fit over said outer conical shaped surface of said first disc pack hub.
Claim 35
Dependent Claim
41 words
A twin disc pack assembly as defined in claim 32 wherein said first disc pack hub has a fixed drive pin fabricated therein and said second disc pack hub has a hole fabricated therein for mating with said fixed drive pin.
Claim 36
Dependent Claim
39 words
A twin disc pack assembly as defined in claim 32 wherein said first disc pack hub has a plurality of stabilizing pins mounted thereon equidistant from the center of said first disc pack hub but at different radial angles.
Claim 37
Dependent Claim
54 words
A twin disc pack assembly as defined in claim 34 wherein said first disc pack hub has a plurality of stabilizing pins mounted thereon equidistant from the center of said first disc pack hub but at different radial angles and said second disc pack hub has a surface for mating with said stabilizing pins.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |